Mortise lock



Aug.2s,1923. l 1,466,298"4 E. HOFFMAN 'L MORTISE LOCK Filed Oct. 23, 1922 I f anne/144501 Edward Hqffman/ lsatented Atang.. 28, 19Z3 ree.

EDWARD HOFFMAN, oF LOGAN, UTAH.

MORTISE LOCK.

Apiilicaton led @ctoeer 23, 1922. Serial No. 596,3"3-

To all whom t may concern.' l

Be it known that l, Emmen.Horrimn, a citizen of the United States, residing f at Logan, in the county of Cache and State of Utah, have invented certain new and useful improvements in Mortise Locks, of which the following is a specification.

rlhe invention relates to mortisc locks, and has as an object the provision of a latch and lock of this nature which may be inserted in an opening 'provided by a bit without the use of a chisel. l. j

A further object of the invention is the provision of a device of this nature which has an exceedingly simple locking mechanism. A further object vof .the invention the provision of such a device which shall be cheap to manufacture and simple to assembleand made of few parts. j An illustrative embodiment of the invention is shown in the accompanying drawings, in which- 3 f Fig. 1 is an elevation of a portion of a door Vwith the lock in place;

Fig. 2 is a central horizontal section show ing the device in a locked position;

Fig.- 3 is a central vertical section online 3 3 of Fig.. 2; f

Fig, t is a detail section showing the bolt retracted;

F L5 is a detail side elevation, partly in section, of the showing of Fig. and

Fig. 6 is a perspective view of a keyto operate the lock as shown. l

The lock is shown as comprising'a casing 10, which is tubular in form, and has a flange 11 for securing the device in place. A single bolt 12 is shown having the beveled surface 13 at its end for coaction with a keeper and as being tubular in form and open at its rear end. The bolt 12 is of such a size as to slide freely within the casing 10. To provide an abutment for the spring 14 which, acting in compression, projects the bolt 12, a plug 15 is provided which is rendered immovable with relation tothe casing by means of a screw 16 passing through a plane walled opening in the plug` and which takes into the screw threads in the walls of the casing 10 at 17 and 18.

To provide for movement of the bolt 12 in the casing 10` slots 19 are provided in the walls of the tubular bolt 12 which slots move past the screw 16 as the bolt 12 is retracted and projected in use.

To lock the bolt 1 2 against movement when desired a screw 20' is provided which is threaded upon its periphery and takesinto a threaded hole 21 in the plug 15.W'hen it is desired to loekthe bolt a key ,22, the'end of which is shaped like ascr'ew driver', and thereby is adapted to' coact with the slot 23 in the end of the locking member 20, is inserted in the Vkeyhole l24 and they screw.V is turned in either direction toaposition such as shown in Fig. 2, when the wall of the tubular'bolt 12 will be rendered immovable by projection of the screw bolt 2O at one side or the other of the plug 15,. The shapeY ofv the v.keyhole 24 is such that the key 22may coact with the projection 25V thereof,' and if left in the lockthe bolt 2O willbe rendered immovable by an unauthorized person from the other side of the door, and more over there being no opening entirely through the Vdoor it will be impossible for such person to work the key out, as is possible ,with locks of usual form. To bring` about acoaction between the key and the notch 25, the key is inserted into the slot in the screw 2O far enough to secure an operative engagement. The screw is thenl turned until the key has traveled through the keyhole' 24E, as far as possible, without interference by the notch 25. Then with-the key inthe proper position of rotation it is shoved up into the slot in the screw and into the notch coincidently,

therebylocking` the screw against rotation from the opposite side of the door.

To retract thebolt 12 manually, when not locked, a squared shaft 26, provided with knobs 2T at its ends, accordingto the usual practice, is passed through openings'28 in the casing 10, slots 29 being provided in 1 Y' the walls of the bolt 12 to permit reciprocation of the bolt past the shaft, and a. bolt operating member 30 is provided upon the shaft. To permit action of the member 30 slots 31 are provided in the wall of the casing. 10 which slots 31 are in alignment with the slots 19 in the b-olt already described. lVith the lock in the position shown in Fig.v 3 if the bottom of the shaft 26 be revolved Vto the left the member 30 will impinge upon the rear 'end of the lower slot 19, as at 32, thereby-forcing the lock to the rear and into the position shown in Figs. l and 5. VThe revolutionof the shaft in the opposite direction will cause the member 30 to coa'ct with the rear end of the upper slot 19 in reverse manner from that described, with retraction of the bolt 12.'

, normal position.

A keeper 33 having a circular hole there- 'in may be secured upon a door-jainb vfor j coaction ith the bolt l2. Minor changes may be madein the physical embodiment of the invention without departing from its spirit. Y

Having thus described my invention what I claim as new and desire to secure byY Letters Patent is,h

f l. A niortiselocl comprising, in combination,a tubular shell,` a tubular bolt reciprocable therein, a plug ironici/ably secured in said shell, a spring abutting against said plug and said bolt for projection of the bolt,

and means for locking said bolt to said plug.

i 2. A mortise lock comprising, in combination, a tubular shell, a tubular bolt reciprocable therein, a plug iinniovably secured -within said shell and placed within said tubular bolt a s drin@` abiittino' a `ainst said c c plug and said bolt, said bolt having slots for coaction with a cam a knob shaft a cani ron said shaft for actuation of said bolt by coactionwith said slots.

3. A in-ortise lock comprising, in combination, a tubular shell, a tubular bolt reciprocable in said shell, a plug within said bolt keyhole when said iininovably secured to said shell, locking means in said plug` adapted to be projected therefrom to loclt said bolt against movement. j

4. A niortise lock comprising, in combination, a tubularshell, a tubular bolt recipi'ocable therein, a plug within said bolt immovably secured to said shell, a spring within said bolt abutting against said plug and an end of said bolt, a screw threaded ,opening in said bolt, a screw threaded locking *plug coacting with said opening, said bolt having openings aligning withl saidY screw threaded opening whereby revolution 'of said screw threaded plugr will project the saine into an opening inl said bolt to loch the same.

5. A inortise lock comprising, in combination, a tubular shell, a tubular bolt reciprocable therein, a plug within said'bolt immovably secured to said shell'an'd having a screw threaded peii'oration, a screw threaded locking plug in said perforation',

said bolt having openings in alignment with said screw threaded opening when thebolt is projected, a :tace plate'having a keyholeA therein in alignment with said openings, and

ineans t0 prevent revolution of a key in said plug is inlocling' position.

EDWARD HOFFMAN; 

